CHAPTER LXII. 

 THE FLAGELLATA. 



Section I. The Trypanosomata. 

 Introduction. 



1. Trypanosoma lewisi, the rat trypanosome, p. 805. 



Trypanosomes in rodents other than rats, p. 808. 



2. Trypanosoma equiperdum, the trypanosome of Dourine, p. 809. 



3. Trypanosoma brucei, the trypanosome of Nagana, p. 811. 



African Trypanosomiases related to Nagana, p. 813. 



4. Trypanosoma evansi, the trypanosome of Surra, p. 814. 



5. Trypanosoma equinum, the trypanosome of Mai de Caderas, p. 814. 



6. Trypanosoma theileri, the trypanosome of Galziekte, p. 816. 



7. The trypanosomes of Sleeping sickness, p. 816. 



Trypanosoma gambiense, p. 816. 

 Trypanosoma rhodesiense, p. 820. 



8. Trypanosoma cruzi, p. 822. 



9. Trypanosomes in birds, p. 823. 



10. Trypanosomes in cold-blooded vertebrata, p. 824. 

 Section II. Trichomonas vaginalis, p. 825. 



Other species of Trichomonas, p. 826. 

 Section III. Lamblia intestinalis, p. 827. 



THE Flagellata are free Protozoa characterized by the presence of one or 

 more flagella (which are totally different structures from bacterial flagella) 

 and sometimes by an undulating membrane. Numerous parasites of man 

 and the lower animals belong to this group. 



SECTION I. THE TRYPANOSOMATA. 



The Trypanosomata live as parasites in the blood of man and a large 

 number of the lower animals. They are flagellated organisms with fusiform 

 bodies, a centrally-situated nucleus, and a laterally placed undulating mem- 

 brane. The free thickened border of this membrane terminates behind in 

 the posterior half of the body in a centrosome (kineto-nucleus) or blepharo- 

 plast, while in front it is as a rule prolonged into a free flagellum. A large 

 vacuole is often visible towards the posterior part of the body and in the 

 same part of the parasite chromatin granules staining deeply with nuclear 

 dyes are also found. 



In the blood reproduction takes place by longitudinal binary fission (schizo- 

 gony) : the newly formed elements may undergo further division before they 

 separate and by a repetition of this process a rosette arrangement is produced 

 (vide infra). 



